Answer:
Remote Sensing
is the gathering of information about the Earth from a
distance.
Information can be collected about the land using
special cameras and instruments located:
-
just a few feet above the Earth's surface,
-
from an airplane flying hundreds to thousands of
feet above the ground,
-
or even from a satellite* orbiting hundreds
of miles above the Earth!
Information can be collected about the seafloor using a sonar system
towed on a cable behind a ship . Instead of taking a
picture using light to see, sonar* "sees" using sound.
By
measuring the amount of time it takes sound to travel
from the ship to the seafloor and back to the ship,
and how much the sounds bounces back, we can make a
picture of the seafloor.
Pictures taken by special cameras on airplanes and
satellites and by sonar systems on ships are called
remotely sensed images*. These images are often
collected as digital files. This allows us to use
computers to improve and analyze the images.
